[GHC] #1610: Make arrays safer

[GHC]

#1610: Make arrays safer
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 Reporter:  igloo              |          Owner:  igloo  
     Type:  proposal           |         Status:  closed 
 Priority:  high               |      Milestone:  6.8.1  
Component:  libraries (other)  |        Version:  6.6.1  
 Severity:  normal             |     Resolution:  fixed  
 Keywords:                     |     Difficulty:  Unknown
 Testcase:                     |   Architecture:  Unknown
       Os:  Unknown            |  
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Comment (by amthrax):

 The implementation of `safeIndex` in this change makes it possible to
 perform array references that are not `inRange`.  I've detailed the bug
 and one resolution in ticket #2120.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1610#comment:4>
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